friends don't keep score, and if you do make contact and she rejects you that is better than living your life wondering. You might regret later giving too much weight to the fact that when she was upset she bitched about you and not enough to the fact that she was deeply upset when you weren't with her. Obviously these contrast in her behaviour leads you to believe whatever her reaction was, it was because she missed you
It might be that her ignoring you now if you make contact with her that might give you that closure and you can take the good and know that this is where the friendship ends. It could also be that you can be "hi, how are you?" kinda mates and not necessarily be 3am mates anymore.. and that is fine too.
but as I said before, in my opinion mates don't keep scores, one day you can pull her close and the other day she can pull you close.. thats no big deal at all. we are all human and we all make mistakes.. learning to control yourself and not spill beans sometimes takes more practise for some people then it does for others.
Friends when you are at uni can easily stay with you but its those amazing friendships when you were kids that I tend to wonder about anyway.. so I wouldn't let go of a contact now if I had a few.. and the way you described your friendship ..seems like it is worth it. If you can fondly look back at it now.. you will be more in love with it later.. and thaaat might hurt more if you havent properly closed the door.